5 U.S. Code § 5550b
5.U.S. Code § 5550b is about Compensatory time off for travel. It is under Part 3 (Employees) Subpart D (Pay and Allowances) Subchapter 5 (Premium Pay) Chapter 55 (Pay Administration) of Title 5 (Government Organizations and Employees) of the Code.
(a) Notwithstanding any provision of section 5542(b)(2) or 5544(a), each hour spent by an employee in travel status away from the official duty station of the employee, that is not otherwise compensable, shall be treated as an hour of work or employment for purposes of calculating compensatory time off.
(b) An employee who has any hours treated as hours of work or employment for purposes of calculating compensatory time under subsection (a), shall not be entitled to payment for any such hours that are unused as compensatory time.